Amazing job Delthor! I like the art and the game is really funny, keep developing!
If you don't mind I found a few bugs that should be easy to fix:
-Sometimes when you pick a new weapon you end up having 2 weapon equiped.
-Other times the pickup starts shooting when you shoot your weapon.
-The screen size is too big for browser, try with 1080x720, because as it is now you can't see your current health.